William butlee



(No Model.) 2 Sheets-Sheet 1.

'W. BUTLER, Jr, & W. H. CLARKE. DERRICK FOR USE ON DREDGING MAGHINES.

No.;35'7,5201. "Pat 26d Feb. 8, 1887.

. 1755555. [UV/917127751 M284, gag

(No Model.) 1 2 Sheets-Sheet 2.

W. BUTLER, Jr, 85'. W.H. CLARKE. DERRICK FOR USE ON DREDGING MACHINES.

No. 357,520. Patented Feb. 8, 18 87.

. the class of machines in which dredges, steam- ,of the class abovestated.

UNITED STATES PATENT lrricn.

WILLIAM BUTLER, JR, AND WILLIAM H. CLARKE, OF LOOKPORT, N. Y.

DERRICK FOR USE ON DREDGlNG-MACHINES.

SPECIFICATION forming part of Letters Patent No. 357,520 dated February8, 1887.

Application filed July 22, 1886.

To aZZ whom, it may concern:

Be itknown that we, WILLIAM BUTLER, J12, and WILLIAM H. CLARKE, bothcitizens of the United States, and residents of Lockport, in the countyof Niagara and State of New York, have invented certain new and useful.Improvements in Derricks for Use on Dredging-Machines, of which thefollowing is a specification.

Our invention relates to improvements in shovels, derricks, and the likeare embraced, which embody a swinging boom, crane, arm, or table; and ithas special reference to swinging derricks or derrick, being used inconnection with the boom or crane of the dredge, said derricks orderrick being built on and forming part of the complete dredge, in placeof using a separate and distinct derrick placed on trucks, for which atrack has to, be laid on the ground at the side of the out being made bythe dredge, for which work an extra gang of men is employed, and in manyplaces a sort of trestle has to be built to support the track; also, byour invention, when the dredge is moved ahead for making another cut thederrick is moved with it and at the same time, as the derrick orderricks form part of the dredge. Such moving ahead by the old methodnecessitated two gangs of men, one for the dredge and another for thederrick. In some classes of work a separate derrick cannot be used. InVery many such cases the use of our invention would materially lessenthe cost of the dredging being done.

In the drawings we represent our invention as applied to adredging-machine. It is, how ever, applicable also to the machinesgener'all y The same letters refer to the same parts in both thefigures.

Figure 1 represents a side elevation of the invention. Fig. 2 representsa plan of the same.

A is the dredge hull or float.

B is the boom or crane.

O is the dipper-handle, and D is the dipper or bucket.

E is the A-franle for supporting the boom.

F F E are the anchors or spuds for holding the machine to its work.

Serial No. 208,893. (No model.)

G G G are the anchor-slides for guiding the anchors, which may also beutilized as part of frame to support bearings b b of derrickmast H.

I I are the derrick-booms supported by the guys a a a a.

.TJ are the swinging circles, around which a chain or wire rope,h h, ispassed and made fast to said circle, and then led back to the swingingdrums, which form part of the inside machinery placed, as desired, inthe hull.

K K K are braces for the purpose of supouter end of the derrick-boom, asshown on g V drawings, the other end passing over sheaves to thewinding-drum located in the machineryroom of the dredge. It will beunderstood that as this chain is wound on the windingdrum the box f israised vertically, and as the chain is unwound or allowed to run fromthe winding-drum the box f is lowered vertically.

The swinging circles J J are circles or segments of circles built ofwood or iron, and are used to spread the swinging chains h it apart fromthe center lines of booms,in order that a greater purchase may beobtained tb swing said booms. The swinging chains h it pass along theouter circumference of the circles on their way to the winding-drumsinside the dredge. V

The operation of our invention as applied to a dredge is substantiallyas follows: The dipper D is lowered and brought into position tocommence a cut of the depth desired, and is then drawn forward andupward by means of the hoisting-chain e and machinery (not shown) untilit is raised above the surface of 100 the water. It is then swung roundto a position convenient for dumping the load into the derrick-box f,which has in the meantime been lowered into a convenient position forreceiving its lead. The derrick-box is then raised by means of thehoisting-chain g and machinery in the hull (not shown) high enough toclear any obstructions there may be in the way. The der rick-boomI isthen swung by means of the chain h around the swinging circle J andmachinery (not shown) to the place it is desired to dump the load 011the bank. Theloaded box is then dumped and returned to its position toreceive another load, which the dredge proper has dug in the interval.

XVe do not limit ourselves to the details of construction shown anddescribed, since it will be obvious to all who are familiar with thisart that they may be somewhat departed from and yet our invention beemployed.

Havingvdescribed our invention,we claim That improvement in derricks foruse on dredges comprising a swinging boom carrying a scoop, inconnection with a supplementary swinging boom or derrick mounted on thesame support and carrying a receptacle adapted to receive the load fromthe scoop and convey and deposit it, whereby the reach of thefirst-mentioned boom is greatly increased, substantially as described.

Signed at Lockport, in the county of Niagara and State of New York, this19th day of July, A. D. 1886.

WILLIAM BUTLER, JR. \VM. Pl. CLARKE. Witnesses:

ROBERT COOHRAN, IRVING M. Jones.

